shithub: xmpp

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enable message carbons if server advertises the extension

--- a/xmpp.c

+++ b/xmpp.c

@@ -72,7 +72,7 @@

 	if((e = xmlget(x->ch, "received")) != nil &&

 	   ismyjid(from->v) &&

 	   (ns = xmlgetattr(e->a, "xmlns")) != nil &&

-	   strncmp(ns->v, "urn:xmpp:carbons:", 17) == 0 &&

+	   strcmp(ns->v, "urn:xmpp:carbons:2") == 0 &&

 	   (e = xmlget(e->ch, "forwarded")) != nil &&

 	   (e = xmlget(e->ch, "message")) != nil){

 		x = e;

@@ -151,7 +151,7 @@

 iniq(Xelem *x, int fd)

 {

 	Xelem *e;

-	Xattr *a, *from, *id;

+	Xattr *a, *from, *id, *var;

 	int isget, isset;

 	a = xmlgetattr(x->a, "type");

@@ -202,6 +202,25 @@

 				"<query xmlns='jabber:iq:roster'/></iq>",

 				myjid) < 0)

 				return -1;

+

+			/* enable message carbons https://xmpp.org/extensions/xep-0280.html */

+			if(x->ch != nil)

+			for(e = x->ch->ch; e != nil; e = e->next){

+				if(strcmp(e->n, "feature") != 0)

+					continue;

+				if((var = xmlgetattr(e->a, "var")) == nil)

+					continue;

+				if(strcmp(var->v, "urn:xmpp:carbons:2") != 0)

+					continue;

+				

+				if(fprint(pfd,

+					"<iq type='set' from='%Ӽ' id='lotsofcarbs' xmlns='jabber:client'>"

+					"<enable xmlns='urn:xmpp:carbons:2'/>"

+					"</iq>",

+					myjid) < 0)

+					return -1;

+				break;

+			}

 		}

 	}